The nervous system in vertebrates develops from which of the following germ layers?

Proprioceptors are those,which give the sense of

In Hydra,neural organization is comprised of:

The eyes and ears are examples of .....

Which of the following systems are involved in the regulation and coordination of the human body?
$I -$ Digestive system
$II -$ Endocrine system
$III -$ Excretory system
$IV -$ Nervous system
$V -$ Reproductive system

Neural coordination is